Sample filtering device for instrumental analysis

Abstract

The utility model discloses a sample filtering device for instrumental analysis, which relates to the technical field of sample filtering and comprises a filter bottle, a hose is fixedly connected to one side of the outer wall of the filter bottle, a sealing rubber ring is mounted at the top end of an inner cavity of the filter bottle, a metal filter screen is placed at the top end in the filter bottle, and a plurality of leakage holes are uniformly formed in the bottom surface of the metal filter screen. A sealing rubber ring is arranged between the filter bottle and the metal filter screen, filter paper is placed in the metal filter screen, a plurality of guide rails are fixedly connected to the two sides of the interior of the filter bottle, an annular clamping groove is formed in the outer wall of the metal filter screen, and a plurality of abutting springs are arranged on the two sides of the interior of the filter bottle in a sleeved mode. Through cooperation with the flat contact surface of the bottom of the metal filter screen and the filter paper, the air invasion risk can be remarkably reduced, a sample can be promoted to naturally spread under the action of gravity, leakage holes in the inner wall of the metal filter screen are fully covered, air is prevented from reversely entering a filter bottle through the leakage holes, and therefore the negative pressure of a vacuum pump is prevented from being gradually offset.

Description

TECHNICAL FIELD

[0001] The utility model relates to sample filtration technical field, concretely a kind of sample filtration device for instrument analysis. BACKGROUND

[0002] Sample filtration in instrument analysis is to remove particulate matter, precipitate or impurities in sample by physical separation means to ensure the stability of analytical instrument and data accuracy, usually filter paper filter is used for filtering, which can effectively prevent instrument flow path from being blocked, reduce background interference, and protect precision components such as chromatographic column, spectral detection cell, compatible filter membrane material needs to be selected according to sample properties, while attention should be paid to avoid sample adsorption loss or pollution during filtration, especially in trace analysis, low adsorption filter membrane should be selected preferentially.

[0003] According to the search, a kind of sample filtration device for instrument analysis is disclosed in Chinese patent literature, publication number: CN214319296U, including filter cover, pour ring, collection chamber, filter hopper, vacuum pump and one isolation plate, the upper surface of pour ring is installed with filter cover, the lower surface of pour ring is installed with one electric push rod, the left end surface of one electric push rod is installed with one isolation plate, the lower surface of pour ring is installed with two electric push rods, the right end surface of two electric push rods is installed with two isolation plates, the lower surface of one isolation plate is installed with fixed ring, the inner side of fixed ring is installed with filter hopper, compared with prior art, the utility model increases vacuum pump, one isolation plate, two isolation plates and filter hopper, realizes the filtration speed of sample can be increased by using pressure difference, at the same time, filter residue prevents filter paper from being blocked, so that the filtering effect is not good, and even if the filtering speed is larger, filter paper can be fixed by filter hopper, to prevent filter paper from being broken by sample.

[0004] The above-mentioned device accelerates sample filtration by the pressure difference generated by the vacuum pump when filtering the sample. As the sample is gradually filtered, the sample inside the V-shaped filter paper gradually decreases, and the area not covered by the sample will continue to be infiltrated by air, weakening the pressure difference formed by the vacuum pump, resulting in a gradual decrease in the filtration speed. In view of this, we provide a sample filtration device for instrument analysis. SUMMARY

[0005] The purpose of the utility model is to make up for the shortcomings of the prior art, and provide a sample filtration device for instrument analysis.

[0006] To achieve the above object, the utility model provides following technical scheme: A sample filtering device for instrument analysis, including filter bottle, the filter bottle outer wall one side is connected with the hose, and the filter bottle inner chamber top is installed with the sealing rubber ring, and the filter bottle inside top is placed with the metal filter screen, the metal filter screen bottom surface all is equipped with a plurality of leakage holes, and the metal filter screen inside is placed with filter paper, the filter bottle inside both sides are all connected with a plurality of guide rails, and the guide rail outer wall is connected with the clamping piece sliding, the metal filter screen outer wall is equipped with annular clamping groove, the filter bottle inside both sides are all equipped with a plurality of resistance springs.

[0007] The metal filter screen bottom end outer wall is fixedly connected with a sample conduit, and the sample conduit is located on one side of the outer portion of the hose.

[0008] The plurality of leakage holes are arranged at positions matched with the inner diameter region of the sample conduit.

[0009] The metal filter screen outer wall and the sealing rubber ring outer wall are tightly attached, and the bottom of the metal filter screen and the filter paper are both provided as flat surfaces.

[0010] The resistance spring one end outer wall is fixedly connected with the clamping piece outer wall, and the resistance spring other end is fixed to one side of the filter bottle inner wall.

[0011] The clamping piece bottom surface one side is clamped with the annular clamping groove inner wall.

[0012] Compared with the prior art, the sample filtering device for instrument analysis has the following beneficial effects:

[0013] First, when the hose is connected to an external vacuum pump, the sealing rubber ring installed between the filter bottle and the metal filter screen, in cooperation with the flat contact surface between the bottom of the metal filter screen and the filter paper, can significantly reduce the risk of air intrusion, promote the sample to naturally spread under the action of gravity, fully cover the leakage holes of the inner wall of the metal filter screen, and block the air from entering the filter bottle from the leakage holes in the reverse direction, thereby avoiding the gradual cancellation of the negative pressure of the vacuum pump. At the same time, the flat surface design of the metal filter screen and the filter paper further limits the possibility of air intrusion from the lateral gap, so that the filtration efficiency of the vacuum pump remains relatively stable throughout the process.

[0014] Second, the resistance spring can push the clamping piece to firmly fix the metal filter screen at the top end of the filter bottle, and force the metal filter screen to attach to the outer wall of the sealing rubber ring.

[0015] Other advantages, objects and features of the utility model will be described in the subsequent specification to some extent, and to some extent, it will be obvious to those skilled in the art based on the study of the following text or can be taught from the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a three-dimensional structure schematic view of the utility model;

[0017] Figure 2 It is a front cut three-dimensional structure schematic view of the utility model;

[0018] Figure 3 It is a partial split cut three-dimensional structure schematic view of the utility model sealing rubber ring, metal filter screen, filter paper and sample conduit;

[0019] Figure 4 It is the utility model Figure 2 Partial enlarged three-dimensional structure schematic view of A.

[0020] In the drawing: 1, filter bottle; 101, hose; 2, sealing rubber ring; 201, metal filter screen; 202, leakage hole; 203, filter paper; 204, sample conduit; 3, guide rail; 301, clamping piece; 302, annular clamping groove; 303, abutting spring. Specific implementation

[0021] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0022] As Figures 1-4 shown, the utility model provides a kind of technical scheme: a kind of sample filtering device for instrument analysis, including filter bottle 1, filter bottle 1 outer wall one side is fixedly connected with hose 101, and filter bottle 1 inner chamber top is equipped with sealing rubber ring 2, and filter bottle 1 inside top is placed with metal filter screen 201, multiple leakage holes 202 are all set in the bottom surface of metal filter screen 201, and filter paper 203 is placed in the inside of metal filter screen 201, multiple guide rails 3 are fixedly connected on the both sides of filter bottle 1 inside, and clamping piece 301 is slidably connected on the outer wall of guide rail 3, annular clamping groove 302 is set on the outer wall of metal filter screen 201, and multiple abutting springs 303 are sleeved on the both sides of filter bottle 1 inside.

[0023] when hose 101 is connected to external vacuum pump, by the sealing rubber ring 2 of filter bottle 1 and metal filter screen 201 between installation, cooperate the flat contact surface of metal filter screen 201 bottom and filter paper 203, air invasion risk can be significantly reduced, can promote sample to spread under the action of gravity, fully cover the leakage hole 202 of metal filter screen 201 inner wall, and block air to pass through leakage hole 202 and enter filter bottle 1 inside reversely.

[0024] As Figures 1-3As shown, a sample conduit 204 is fixedly connected to the outer wall of the bottom end of the metal filter 201, and the sample conduit 204 is located on the outside side of the hose 101, ensuring that the liquid flow path and the vacuum pump power transmission path do not interfere with each other when the hose 101 is evacuated.

[0025] Multiple leakage holes 202 are positioned to match the inner diameter area of ​​the sample conduit 204 below, ensuring that the liquid can be uniformly guided along the preset path after being filtered by the metal filter screen 201, and can guide the sample to enter the filter bottle 1 smoothly.

[0026] The outer wall of the metal filter 201 is tightly fitted to the outer wall of the sealing ring 2, and the bottom of both the metal filter 201 and the filter paper 203 are set as flat surfaces. Under the action of gravity, the sample will fully cover all the leakage holes 202 opened on the inner wall of the metal filter 201.

[0027] like Figure 4 As shown, one end of the outer wall of the contact spring 303 is fixedly connected to the outer wall of the clip 301, and the other end of the contact spring 303 is fixed to one side of the inner wall of the filter bottle 1. The thrust of the contact spring 303 ensures that it is engaged with the annular groove 302 from beginning to end.

[0028] The bottom side of the clip 301 engages with the inner wall of the annular groove 302. By opening the annular groove 302, the metal filter screen 201 can be fixed to the top of the filter bottle 1 by utilizing the engagement relationship between the clip 301 and the annular groove 302.

[0029] Working principle: Ensure that the liquid flow path and the vacuum pump power transmission path do not interfere with each other when the hose 101 is evacuated. Ensure that the liquid can flow evenly along the preset path after being filtered by the metal filter 201. This can guide the sample to enter the filter bottle 1 smoothly. Under the action of gravity, the sample will fully cover all the leakage holes 202 opened on the inner wall of the metal filter 201. Utilize the pushing force of the anti-spring 303 to ensure that it is engaged with the annular groove 302 from beginning to end. The engagement relationship between the clip 301 and the annular groove 302 can be used to fix the metal filter 201 to the top of the filter bottle 1.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sample filtration device for instrumental analysis comprising a filter flask (1), characterised in that: The outer wall of the filter bottle (1) is fixedly connected with a hose (101), a sealing rubber ring (2) is installed at the top end of the inner cavity of the filter bottle (1), a metal filter screen (201) is placed at the top end of the inner cavity of the filter bottle (1), a plurality of leakage holes (202) are formed in the bottom surface of the metal filter screen (201), a filter paper (203) is placed in the metal filter screen (201), a plurality of guide rails (3) are fixedly connected to the two sides of the inner cavity of the filter bottle (1), a clamping piece (301) is slidingly connected to the outer wall of the guide rail (3), an annular clamping groove (302) is formed in the outer wall of the metal filter screen (201), and a plurality of abutting springs (303) are sleeved on the two sides of the inner cavity of the filter bottle (1).

2. A sample filtration device for instrumental analysis according to claim 1, characterized in that: The outer wall of the bottom end of the metal filter screen (201) is fixedly connected with a sample conduit (204), and the sample conduit (204) is located on one side outside the hose (101).

3. A sample filtration device for instrumental analysis according to claim 2, characterized in that: The positions where the plurality of leakage holes (202) are formed are matched with the inner diameter regions of the sample conduit (204) below.

4. A sample filtration device for instrumental analysis according to claim 1, characterized in that: The outer wall of the metal filter screen (201) is tightly attached to the outer wall of the sealing rubber ring (2), and the bottom of the metal filter screen (201) and the filter paper (203) are both provided as a plane.

5. A sample filtration device for instrumental analysis according to claim 1, characterized in that: The outer wall of one end of the abutting spring (303) is fixedly connected with the outer wall of the clamping piece (301), and the other end of the abutting spring (303) is fixed to one side of the inner wall of the filter bottle (1).

6. A sample filtration device for instrumental analysis according to claim 1, characterized in that: The bottom surface of one side of the clamping piece (301) is clamped with the inner wall of the annular clamping groove (302).

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